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Hello, 

Would you mind providing more information i.e. what specifically did you add/change, and what version of nRF Connect SDK are you running?

Kind regards,
Øyvind

Hi, the nRF connect is 3.10.0. How may I send the whole project to you to test at at your end.

Hi, how to use arm-none-eabi-addr2line in SES ?

Please note: 
Out-of-the-box support for Segger Embedded Studio Nordic Edition (SES-NE) will not be present in nRF Connect SDK 2.0 and later versions. This means that from 2.0, nRF Connect SDK will no longer be supported for use with SES-NE. This does not mean that Segger Embedded Studio standard edition (SES)  will be made unavailable for nRF5 SDK customers or nRF Connect SDK 1.x customer using SES-NE. The free license for Nordics customers will be continued, and support for existing customers will continue. But from nRF Connect SDK 2.0 onwards the development platform promoted by Nordic will be based on an extension to Visual Studio Code. Customers working in SES-NE can migrate their work to VS Code using the “Add an existing application” feature in VSCode.
Nordic now has a dedicated development team working on VSCode and this means Nordic can define the priorities for the platform and enable a tight integration with the SDK and the devices.

The arm-none-eabi-addr2line is a command line tool found in gnu arm embedded toolchain. 

In the Log of errors, os: is written ... does os mean Operating System and is it related to Zephyr OS ? Also, is it due to some wrong coding, wrong buffer size defined and used ? I could not understand the reason of such error ?

Please see this guide on handling hard faults in Zephyr.

I added some code for events of an external device.

Without having the details on what you have edited/added/customized in you project, it will be difficult to help. You will need to debug your project. The addr2line tool will allow you to find root of cause. 

How may I send the whole project to you  ?? I added the Kconfig file with contents as below. The default stack size set is 512. I think, the error may be due to this ? How to decide this size ? Should I try by setting 2048 etc 

#*************************
menuconfig BMS_MODULE
bool "Bms module"
default y

if BMS_MODULE

config BMS_THREAD_STACK_SIZE
int "BMS module thread stack size"
default 512

endif # BMS_MODULE

module = BMS_MODULE
module-str = bms module
source "subsys/logging/Kconfig.template.log_config"

How may I send the whole project to you  ?? I added the Kconfig file with contents as below. The default stack size set is 512. I think, the error may be due to this ? How to decide this size ? Should I try by setting 2048 etc 

#*************************
menuconfig BMS_MODULE
bool "Bms module"
default y

if BMS_MODULE

config BMS_THREAD_STACK_SIZE
int "BMS module thread stack size"
default 512

endif # BMS_MODULE

module = BMS_MODULE
module-str = bms module
source "subsys/logging/Kconfig.template.log_config"